Trigger pull length checking gauge for firearms



5 M m mm m m5# un. L W A Oct. 18, 1960 D. H. sHAFl-'ER TRIGGER PULL LENGTH CHEGKING GAUGE FOR FIREARMS Filed sept. 26. 195e TRIGGER PULL LENGTH CHECKING vGAUGE FOR FIREARMS Daniel H. Shaffer, 23015 Shakespeare, East Detroit, Mich.

Filed Sept. 26, 1958, Ser. No. 763,757

2 Claims. (Cl. 33174) This invention relates generally to improvements in gun stock gauges, and, more particularly, to a novel and improved gun stock gauge for gauging or checking the trigger pull length of firearms for litting the same to persons using them.

In order to obtain accuracy and ease in shooting a firearm it is important that the stock of the lirearm be fitted to the user whereby the trigger pull length is correct for the particular person using the firearm, that is, the length of the stock from the trigger to the center of the butt plate. Accordingly, it is the primary object of the present invention to provide an improved gauge for checking the trigger pull length of firearms whereby the correct length of the stock may be accurately determined for any particular user purchasing a firearm.

It is a further object of the present invention to provide a gun stock gauge of the class described which is simple and rigid in construction, economical of manufacture, eicient and reliable in use and well adapted for the purpose for which it is designed.

Other objects, features and advantages of this invention will be apparent from the following detailed description and appended claims, reference being had to the accompanying drawing forming a part of the specilication wherein like reference numerals designate corresponding parts of the several views.

In the drawing:

Fig. 1 is a fragmentary side elevational view, with parts broken away of a gun stock gauge made in accordance with the principles of the present invention;

Fig. 2 is a side elevational view of an adjusting nut employed in the structure of Fig. 1;

Fig. 3 is an end elevational view of the structure listed in Fig. 2 taken in the direction of the arrow marked 3; and,

Fig. 4 is an elevational sectional view of the structure listed in Fig. 1, taken along the line 4-4 thereof and looking in the direction of the arrows.

Referring now to the drawing and in particular to Fig. l, a gun stock gauge embodying the principles of the invention is shown and comprises the gun stock 10 which is shaped in the usual manner and which is provided on the forward end thereof with the usual trigger guard 11 and trigger mechanism 12. The trigger pull length which may be gauged or checked by the device of the present invention would be the distance between the trigger 12 and the center point marked 13 on the rear concave face of the butt plate generally indicated by the numeral 14. The butt plate 14 is adjustably mounted on the rear end of the gun stock 10 for movement longitudinally thereof and comprises the plate 15 and the rest pad 16. The rest pad 16 is preferably made from a suitable hard rubber material or the like and is iixedly secured to the outer end face of the plate 15 by any suitable means as by the screws 17.

The butt plate 14 is provided with the two vertical spaced apart elongated guide rods 18 and 19 which are xedly mounted at their outer ends in suitable apertures ates Patenti@ F in the plate 15 as by means of a press t. As shown in Figs. 1 and 4, the upper guide rod 18 is`slideab1y mounted through the hole 20 in the carrier orm'ounting plate 21. The'guiderrod 18 also extends beyond the plate 21 and into the elongated bored hole 22 formed in the upper rear end of the gun stock 10.` As 'shown :in Figs. l and 4, the carrier plate 21 is xedly securedon the rear end of the gun stock 10 by a suitable means as bythe screws 23. The lower guide rod 19 is yslidably mounted through the hole 24 which is formed in the lower end of the carrier plate 21. The guide 'rod 19 extends beyond the plate 21 and passes through the elongated hole 25 in the lower end of the gun stock 10.

Y The butt 'plate 14 is adapted to be moved relative to the gun stock 10 by means vof the elongated' adjusting screw and the knurled nut and these parts are generally indicated by the numerals 26 and 27, respectively.

As shown in Fig. 1, the outer reduced end 28 of the screw 26 is threadably mounted in the hole 29 in the plate 15 so as to lixedly mount the screw 26 on the plate 15. The nut 27 includes the large annular portion 30 and the integral reduced annular hub portion 31. The nut 27 is provided with the axial threaded hole 32 through which the adjacent screw 26 is threadably mounted. As shown in Fig. 1, the screw 26 is adapted to extend into the elongated bored hole 33 in the gun stock 10.

The hub portion 31 on the nut 27 is rotatably journalled in the hole 34 formed in the carrier plate 21 and this hole is in axial alignment with hole 33 in the gun stock 10. The nut 27 is retained on the plate 21 by means of the retainer C-clip 35 which is mounted in the annular groove 36 formed on the outer end of the journalled portion 31. As seen in Figs. 1 and 4, the retainer clip 35 is adapted to be seated in the transverse slot or recess 37 formed in the front face of the carrier plate 21. A second C-clip 38 is mounted on the inner end of the adjusting screw 26 in the annular groove 39 and this second clip acts as a stop member when the screw 26 is threaded outwardly to the right as viewed in Fig. l. In operation, in order to check the trigger pull length of a person, the knurled knot 27 would be rotated counterclockwise as viewed in Fig. 4 so as to move the butt plate 14 to the right as viewed in Fig. l. The butt plate 14 would be moved until it reaches a dotted line position such as that indicated by the numeral 40 in Fig. 1 at which point the distance between the trigger 12 and the center point 13a on the butt plate would be the correct pull length for the particular person being checked. A firearm may then be made for the person so checked and with a gun stock that is made to the correct length as checked by the gauge whereby the user may shoot the gun with greater ease and accuracy. It will be understood that the carrier plate 21 and the movable butt plate 14 and the other associated parts may be mounted on the gun stock of a conventional firearm to make a complete checking gauge so it could be mounted on a portion of a firearm as illustrated in Fig. 1. The plates 15 and 21, and the guide rods 18 and 19 and the screw 26 and nut 27 are preferably made from a light weight material as alummum.

While it will be apparent that the preferred embodiment of the invention herein disclosed is well calculated to fulll the objects above stated, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope or fair meaning of the subjoined claims.

What I claim is:

l. A gun stock gauge of the class described comprising: in combination, a gun stock having a trigger means on the forward end thereof; an extension means mounted on the rear end of said stock including, a carrier plate tixedly mounted on the rear end of the stock, an adjusting screw threadably mounted through said carrier plate and extendable into an elongated bore in said Stock, a butt plate xedly mounted on the outer end of the adjusting screw, a pair of guide rods having the outer ends thereof xed to said butt plate and the inner ends thereof slidably mounted through said carrier plate and into a pair of elongated bores in said stock, and, said adjusting screw being adjustable longitudinally of Said stock by means of an adjusting nut which is rotatably journalled in said carrier plate.

2. A gun stock gauge of the class described comprising: in combination, a gun stock having a trigger means on the forward end thereof; an extension means mounted on the rear end of said stock including, a carrier plate ixedly mounted on the rear end of the stock, an adjusting screw threadably mounted through said carrier plate and extendable into an elongated bore in said stock, a butt plate ixedly mounted on the outer end of the adjusting screw, a pair of guide rods having the outer ends thereof xed to said butt plate and the inner ends thereof slidably mounted through said carrier plate and into a pair of elongated bores in said stock, said adjusting screw being adjustable longitudinally of said stock by means of an adjusting nut which is rotatably journalled in said carrier plate, means for limiting the adjustment travel of said screw, and, means for retaining said nut in said carrier plate.

References Cited in the le of this patent UNITED STATES PATENTS 2,121,982 Pugsley June 28, 1938 FOREIGN PATENTS 1,157 England 1889 2,800 England 1893 24,995 England 1899 

